// is {{.To.Config.Service}}, this will return "To" as the parameter.
		// That's all we need when looking for well-known params.
		firstIdentifier := n.(*parse.FieldNode).Ident[0]
		out.Insert(firstIdentifier)
	case parse.NodeIf:
		out.Merge(getParams(n.(*parse.IfNode).Pipe))
	case parse.NodeWith:
		out.Merge(getParams(n.(*parse.WithNode).Pipe))
	case parse.NodeRange:
		out.Merge(getParams(n.(*parse.RangeNode).Pipe))
	case parse.NodeAction:

For each OS, there is a hand-written Go file at `${GOOS}/types.go` (or
`types_${GOOS}.go` on the old system). This file includes standard C headers and
creates Go type aliases to the corresponding C types. The file is then fed
through godef to get the Go compatible definitions. Finally, the generated code
is fed though mkpost.go to format the code correctly and remove any hidden or
private identifiers. This cleaned-up code is written to
`ztypes_${GOOS}_${GOARCH}.go`.